refactor(onboard): make finalization return FSM result

[cv]

Summary

Make the finalization handler return an explicit terminal FSM result instead of completing the session inside the handler. The live onboard flow now applies that result through OnboardRuntime via the runtime boundary.

Changes

• Change handleFinalizationState() to return completeOnboardMachine(...) metadata and updates.
• Add recordStateResult() to OnboardRuntimeBoundary and use it from src/lib/onboard.ts after finalization completes.
• Update finalization tests to assert the returned FSM completion result.

Type of Change

• Code change (feature, bug fix, or refactor)
• Code change with doc updates
• Doc only (prose changes, no code sample modifications)
• Doc only (includes code sample changes)

Verification

• npx prek run --all-files passes
• npm test passes
• Tests added or updated for new or changed behavior
• No secrets, API keys, or credentials committed
• Docs updated for user-facing behavior changes
• npm run docs builds without warnings (doc changes only)
• Doc pages follow the style guide (doc changes only)
• New doc pages include SPDX header and frontmatter (new pages only)

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Signed-off-by: Carlos Villela cvillela@nvidia.com

Summary by CodeRabbit

• Refactor
  • Improved internal state management for the onboarding finalization flow to enhance system reliability and maintainability.

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Selective E2E Results — ✅ All requested jobs passed

Run: 26927284751
Target ref: beb257914b7fbed7d724f3edcf580b5a8e383b4b
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Requested jobs: cloud-e2e,onboard-resume-e2e
Summary: 2 passed, 0 failed, 0 skipped

Job	Result
cloud-e2e	✅ success
onboard-resume-e2e	✅ success